Flatwing Streamer ?

I have been trying to tie up some flatwing streamers, as in smelt patterns,
but have had no luck in tying in the wing. I haven't had much luck searching
the www for instructions about this. The ?'s I have a
1) What is the best type of material for these type wings? Most flies I see
look like they use a duck flank feather.
2) Are these tied in using a whole feather, or just bunches of barbs?
3) If they use a whole feather, how do I get them to appear bunched up, or
narrow looking, instead of looking like a moth wing?
4) Does anyone have any links to some good tying instructions for these.

Thanks to all helpful replies.